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# Topic: Force physics

###### In the News (Thu 20 Jun 19)

 AllRefer.com - force (Physics) - Encyclopedia The magnitude of a force is measured in units such as the pound, dyne, and newton, depending upon the system of measurement being used. Since mass is constant at ordinary velocities, the result of the force is a change in velocity, or an acceleration, which may be a change either in the speed or in the direction of the velocity. The strong nuclear force, or strong interaction, is associated with certain reactions between elementary particles and is responsible for holding the atomic nucleus together. reference.allrefer.com /encyclopedia/F/force.html   (587 words)

 Force article - Force force (disambiguation) physics velocity of motion classical - What-Means.com   (Site not responding. Last check: 2007-10-21) Force is not a fundamental quantity in physics, despite the tendency to introduce students to physics via this concept. Force is rarely measured directly and is often confused with related concepts such as tension and stress. This superposition of forces, and the definition of inertial frames and inertial mass, are the empirical content of Newton's laws of motion. www.what-means.com /encyclopedia/Force   (1585 words)

 Force - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-21) These fundamental forces describe every observable phenomenon; these forces are the strong nuclear force, the electromagnetic force, the weak nuclear force, and the gravitational force. Another unit of force called the poundal (pdl) is defined as the force that accelerates 1 lbm at 1 foot per second squared. The kilogram-force is a unit of force that was used in various fields of science and technology. www.bucyrus.us /project/wikipedia/index.php/Force_(physics)   (1783 words)

 Force field - Wikipedia, the free encyclopedia In general physics, a force field is a vector field representing the gradient of a potential. The vectors that are the values of a force field are forces, and so measured in units of force such as newtons and pounds-force. In the context of molecular modelling, a force field (also called a forcefield) is a more loosely defined term and refers to the functional form and parameter sets used to describe the interactions (potential, forces) within a system of particles (atoms or similarly sized objects). en.wikipedia.org /wiki/Force_field   (468 words)

 AllRefer.com - centripetal force and centrifugal force (Physics) - Encyclopedia For a planet orbiting the sun, the force is gravitational; for an object twirled on a string, the force is mechanical; for an electron orbiting an atom, it is electrical. Thus, in twirling a mass on a string, the centripetal force transmitted by the string pulls in on the mass to keep it in its circular path, while the centrifugal force transmitted by the string pulls outward on its point of attachment at the center of the path. The centrifugal force is often mistakenly thought to cause a body to fly out of its circular path when it is released; rather, it is the removal of the centripetal force that allows the body to travel in a straight line as required by Newton's first law. reference.allrefer.com /encyclopedia/C/centripe.html   (459 words)

 The Physics Classroom Forces may be placed into two broad categories, based on whether the force resulted from the contact or non-contact of the two interacting objects. The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it. The spring force is the force exerted by a compressed or stretched spring upon any object which is attached to it. www.physicsclassroom.com /Class/newtlaws/u2l2b.html   (1027 words)

 The Physics Classroom Action-at-a-distance forces are types of forces in which the two interacting objects are not in physical contact with each other, but are able to exert a push or pull despite the physical separation. Force is a quantity which is measured using a standard metric unit known as the Newton. Because force is a vector and has direction, it is common to represent forces using diagrams in which the force is represented by an arrow. www.physicsclassroom.com /Class/newtlaws/U2L2a.html   (632 words)

 Syvum Physics Theory : Force Force of friction always acts in the direction opposite to the direction of the applied force. of a body is the force (or pull) by which it is attracted toward the earth by gravity (or the gravitational acceleration). Another commonly used unit of force is kgf (kilogram force), which is the force required to lift vertically upward a mass of 1 kg. www.syvum.com /cgi/online/serve.cgi/squizzes/physics/force.html   (497 words)

 Force   (Site not responding. Last check: 2007-10-21) One of the foundation concepts of physics, a force may be thought of as any influence which tends to change the motion of an object. Our present understanding is that there are four fundamental forces in the universe, the gravity force, the nuclear weak force, the electromagnetic force, and the nuclear strong force in ascending order of strength. In mechanics, forces are seen as the causes of linear motion, whereas the causes of rotational motion are called torques. hyperphysics.phy-astr.gsu.edu /hbase/force.html   (239 words)

 The Nature of Science Series #50 -- Physics XVIII: Force and Mass Force is proportional to mass times acceleration (F = kma); if k = unity (i.e., one), then the proportionality factor k can be eliminated from the equation and it then becomes simply F = ma. In short, a force is that which imposes a change in the speed of a body (its magnitude) or in its direction of movement in space, or both (change in the velocity of a body). The so-called "force of friction" is always considered "operating" in the opposite direction to the applied force because no matter from what direction the force is applied, the "force of friction" tends to oppose it. www.chiroweb.com /archives/08/15/14.html   (1539 words)

 Physics Today October 2004- Whence the Force of F = ma? I: Culture Shock While force itself does not appear in the foundational equations of modern physics, energy and momentum certainly do, and force is very closely related to them: Roughly speaking, it's the space derivative of the former and the time derivative of the latter (and F = ma just states the consistency of those definitions!). Force is an abstraction of this sensory experience of exertion. Frank Wilczek is the Herman Feshbach Professor of Physics at the Massachusetts Institute of Technology in Cambridge. www.physicstoday.org /vol-57/iss-10/p11.html   (1898 words)

 Types of Forces   (Site not responding. Last check: 2007-10-21) Previously in this lesson, a variety of force types were placed into two broad category headings on the basis of whether the force resulted from the contact or non-contact of the two interacting objects. The force of gravity is the force at which the earth, moon, or other massively large object attracts another object towards itself. Ultimately, you must be capable of reading a verbal description of a physical situation and know enough about these forces to recognize their presence (or absence) and to construct a free-body diagram which illustrates their relative magnitude and direction. www.glenbrook.k12.il.us /gbssci/phys/Class/newtlaws/u2l2b.html   (1110 words)

 Fundamental Forces One of the four fundamental forces, the electromagnetic force manifests itself through the forces between charges (Coulomb's Law) and the magnetic force, both of which are summarized in the Lorentz force law. The electromagnetic force is a force of infinite range which obeys the inverse square law, and is of the same form as the gravity force. The discovery of the W and Z particles in 1983 was hailed as a confirmation of the theories which connect the weak force to the electromagnetic force in electroweak unification. hyperphysics.phy-astr.gsu.edu /hbase/forces/funfor.html   (1170 words)

 Force (Physics Study Guide) - Wikibooks The acceleration of an object is proportional to the force acting upon it. Consequently, this equation cannot, for example, be applied to the motion of a rocket, which loses its mass (the lost mass is ejected at the rear of the rocket) with the passage of time. This means that for every force applied on a body A by a body B, body B recieves an equal force in the exact opposite direction. en.wikibooks.org /wiki/Force_(Physics_Study_Guide)   (550 words)

 "Getting Around The Coriolis Force" - Revised Nov 15, 2000 Hence, whether using physics to explain the phenomenon or using the phenomenon to explain the physics, students are shaky on both sides of this relationship. The Coriolis effect is a force in the first sense, but not in the second sense: nothing is actually pushing or pulling on anything, the acceleration is due to the fact that the observer is moving in a circle. The net force on air at the eye wall is a centripetal force large enough to keep the air out at a given radius determined by its speed. www.physics.ohio-state.edu /~dvandom/Edu/newcor.html   (2564 words)

 Force : Force (physics)   (Site not responding. Last check: 2007-10-21) Statics Where the sum of the forces acting on a body in static equilibrium (motionless, Acceleration=0) is zero. Dynamics The sum of the forces acting on a body or system over time is non zero with a resulting set of accelerations defined by detailed analysis of equations derived from F=MA. This superposition of forces, along with the definition of inertial frames and inertial mass, are the empirical content of Newton's laws of motion. www.city-search.org /fo/force-(physics).html   (1281 words)

 Force   (Site not responding. Last check: 2007-10-21) Commonly experienced as a "push" or "pull," force is a vector quantity, having both magnitude and direction. The study of forces in equilibrium is statics; that of forces and motion is dynamics. The gravitational force and the electromagnetic force have an infinite range. www.neutron.anl.gov /hyper-physics/force.html   (169 words)

 Physics > Gravitational Force   (Site not responding. Last check: 2007-10-21) Gravitation is the force of attraction that exists between all particles with mass in the universe. It is the force of gravity which is responsible for holding objects onto the surface of planets and, with Newton's law of inertia is responsible for keeping objects in orbit around one another. However, the main force beween common objects and the earth and between celestial bodies is gravity; this is due to the fact that they (at least one of the two) are electrically neutral to a high degree: even if in both bodies there were a surplus or deficit of only one electron for every 10 www.physics.teleactivities.net /forces/gravity.html   (1438 words)

 The Meaning of Force Force is a quantity which is measured using the standard metric unit known as the Because a force is a vector which has a direction, it is common to represent forces using diagrams in which a force is represented by an arrow. Other situations could be imagined in which two of the individual vector forces cancel each other ("balance"), yet a third individual force exists that is not balanced by another force. www.glenbrook.k12.il.us /gbssci/phys/Class/newtlaws/u2l2a.html   (636 words)

 Comments on the Culture of the Force - Physics Today August 2005 I: Culture Shock" (PHYSICS TODAY, October 2004, page 11) appears to be that although the force is, in Wilczek's words, "vaguely defined," it "continues to flourish" because the microscopic details it conceals are not really relevant for the scale of the phenomena it serves to describe. He commented that "many of the problems of molecular structure are concerned essentially with forces," that "forces are almost as easy to calculate as energies are," and that "the quantities are quite as easy to interpret." Another application of the concept of force is found in nonequilibrium statistical mechanics. Just as the contact force had to be found as the appropriate force to describe the dynamics of the continuum, the physically realistic short-time force derived from the mean instantaneous potential had to be discovered as the force that describes typical chemical dynamics in liquids, www.aip.org /web_bin/pt/vol-58/iss-8/p15.html   (1102 words)

 index.htm Empirical forced fits are almost certainly less accurate and difficult to implement than physical laws. Rock physical properties, pore fluid pressure and load states are a primary concern in most upstream engineering applications. Force balanced mechanical systems are causal relationships described by the governing physics. www.force-balanced.net   (1057 words)

 physicsofsurfing The water exerts its force on every part of the board that it touches yet the buoyant force acts as if it were one force pushing up on the board at the center of buoyancy, which is the center of mass of the water displaced by the board. The surfboard rotates until the buoyancy force through center of mass of the displaced water is aligned with the gravity force on the surfer. The physics here is simple, you push water backwards with your hands and by Newton's law of action and reaction, the water pushes forward on you accelerating you up to speed. www.exo.net /~pauld/activities/surfing/physicsofsurfing.html   (2254 words)

 Slapstick Science   (Site not responding. Last check: 2007-10-21) At the Force’s third or fourth performance (memories vary), Professor Dan Dahlberg of the physics department came aboard as what he calls “the token professor.” Initially, Dahlberg was invited to make only one appearance, but as a performer he was clearly a natural, and the onstage chemistry between the four men was close to perfection. Cattell, who describes herself as normally the type of person who avoids the limelight, says that succeeding on the Physics Force is “mostly a matter of wanting to do it.” She calls service on the Force “pro bono physics” and says that it’s what she does in order to give something back to the community. Cattell says that one of the hardest aspects of being on the Force is curbing her professorial tendency to provide in-depth explanations that would disrupt the show’s pacing. www.it.umn.edu /news/inventing/2003_Spring/slapstick_science.html   (1837 words)

 University of Minnesota TC: Kiosk: On this stage: the irresistible Physics Force So ends another demonstration by the Physics Force, a group of dedicated teachers who bring the laws of physics out of the realm of esoterica and put them squarely on center stage. The Physics Force got a big boost in May 1990, when the American Association of Physics Teachers met in Minneapolis and Johnson arranged a performance in Willey Hall. All this success aside, the most amazing thing about the Physics Force may be its ability to keep going in spite of its members' numerous other commitments and one major setback, the sudden death of Johnson in 1994. www1.umn.edu /urelate/kiosk/10.97text/physics.html   (993 words)

 SparkNotes: SAT Physics: Electric Force Electric force is analogous to gravitational force: the attraction or repulsion between two particles is directly proportional to the charge of the two particles and inversely proportional to the square of the distance between them. Doubling the charge on one of the particles doubles the electric force, but doubling the distance between the particles divides the force by four, so in all, the electric force is half as strong as before. The net force acting on A is the vector sum of the force of B acting on A and the force of C acting on A. www.sparknotes.com /testprep/books/sat2/physics/chapter13section2.rhtml   (648 words)

 Physics at Minnesota: Original Force Jon has taught Physics at the secondary and college level, is an American Association of Physics Teachers Apparatus Competion winner and along with fellow Physics Force member, Hank Ryan, received the Meggars Award through the American Institute of Physics to develop Physics Laboratory activities. Dan Dahlberg is Professor of Physics, School of Physics and Astronomy, University of Minnesota and has been a member of The Physics Force since 1986. He is a teacher at Mounds View High School and along with fellow Physics Force member, Jon Barber, received the Meggars Award through the American Institute of Physics to develop Physics Laboratory activities. www.physics.umn.edu /outreach/pforce/original.html   (376 words)

 Force in physics - definition and explanation Forces can cause motion, but they are not always correlated with motion. There are hundreds of object around us on which forces are acting, but which are not moving. force is “something” which can change the state of motion. www.staff.amu.edu.pl /~romangoc/M3-1-force-physics.html   (117 words)

 Science: PHYSICS: Gentle Force of Entropy Bridges Disciplines@ HighBeam Research   (Site not responding. Last check: 2007-10-21) Normally, entropy is a force of disorder rather than organization. But physicists have recently explored the ways in which an increase in entropy in one part of a system can force another part into greater order. Anyone who has tried to reunite two socks after a tumble in the dryer is well acquainted with entropy. www.highbeam.com /library/doc0.asp?DOCID=1P1:28868860&refid=ip_encyclopedia_hf   (178 words)

 Physics Activity - Force & Distance on an Incline   (Site not responding. Last check: 2007-10-21) To investigate the relationship between the force required to move an object up an incline, the distance it moves, and the work done. However, you have to exert the force for a longer distance on the incline. Put the clamp on the ring stand to hold one end of the incline as shown in the diagram. www.batesville.k12.in.us /physics/PhyNet/Mechanics/Energy/Labs/ForceAndDistance.html   (218 words)

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